Table 3.

Leg and Trunk Impairments Predicting Limitations in Participation in Life Roles Mediated by Changes in Activities Over 2 Years

Variable	Beta Coefficient (95% CI)
	Direct Effect	Indirect Effect	Total
Changes in lower-extremity activities	2.87 (1.78 to 5.58)*	—	—
Ankle ROM	4.70 (0.15 to 10.70)*	−4.24 (−10.73 to −0.5)*	0.46 (−2.80 to 3.73)
Leg speed	4.53 (0.58 to 9.65)*	−1.81 (−6.81 to 1.80)	2.72 (−0.52 to 6.08)
Trunk extensor endurance	-0.86 (-6.05 to 3.13)	4.18 (0.93 to 10.81)*	3.33 (0.21 to 6.57)*

Notes: Models adjusted for baseline participation, age, and sex. Coefficients are presented for physical impairment test performance above the median. Participation and activity score range: 0–100; higher is better. ROM = range of motion.

*95% CI does not contain 0.